- Field measurement of harmonic distortion- how? - 1 Update
- Increasing 20x4 LCD contrast range - 5 Updates
- Windows 11 coming soon, Windows 10 retiring from 2025 - 4 Updates
| Wond <lost@the.ether.net>: Jun 30 03:09PM On Mon, 28 Jun 2021 22:28:19 -0700, Phil Allison wrote: > So don't use one. > Regular mains power is gonna be fine. > ..... Phil My thinking too, but it appears from available bumf that inverter types claim less THD than cheap conventional gens. It would be interesting to see how Agilent/Keysight measure it in their DMM. Thanks for reply. |
| bitrex <user@example.net>: Jun 29 06:51PM -0400 Replaced the LCD and backlight assembly in my old Emu ESI-4000 sampler: <http://www.vintagesynth.com/emu/esi4000.php> Which after 25 years even the LED back lighting was starting to get annoyingly dim. Replaced it with one of these white-on-black units which works fine and looks pretty good: <https://www.buydisplay.com/arduino-black-lcd-20x4-i2c-code-character-module-display-high-contrast> Except that the software-adjustable contrast range, which was probably optimal for a black-on-yellow display, can't bring the CV up enough to avoid some "blockies" shining through. I'm wondering if there's a quick hack to get some more range. Or maybe it would be better to put a resistor in line with the backlight supply to reduce bleed-thru. The "Turbo" board on these adds some of the nicest digital filters there were in a hardware sampler of the era: <https://www.youtube.com/watch?v=zEg60WzYco4> |
| Rheilly Phoull <rheilly@bigslong.com>: Jun 30 09:27AM +0800 On 30/06/2021 6:51 am, bitrex wrote: > The "Turbo" board on these adds some of the nicest digital filters there > were in a hardware sampler of the era: > <https://www.youtube.com/watch?v=zEg60WzYco4Do Do you mean the pot that adjusts the light level cannot provide enough contrast without the :blockies: showing ? All the units I have seem pretty bright without the "Blockies". |
| bitrex <user@example.net>: Jun 29 11:12PM -0400 On 6/29/2021 9:27 PM, Rheilly Phoull wrote: > Do you mean the pot that adjusts the light level cannot provide enough > contrast without the :blockies: showing ? All the units I have seem > pretty bright without the "Blockies". Yeah. It's a little difficult to capture this particular color scheme correctly on a cell phone camera but at the maximum range of the control it looks kinda like this: <https://imgur.com/a/liLGsd9> And unfortunately the contrast is controlled in software, probably via PWM there's no direct connection to an analog adjustment pot. I might swap it for an OLED display instead, or just go back to the boring black on greenish-yellow. Hmpf. |
| bitrex <user@example.net>: Jun 29 11:18PM -0400 On 6/29/2021 9:27 PM, Rheilly Phoull wrote: > Do you mean the pot that adjusts the light level cannot provide enough > contrast without the :blockies: showing ? All the units I have seem > pretty bright without the "Blockies". I got pic of it by turning off the HDR on my camera, it looks about like this at the maximum excursion of the contrast control. A lil worse in the pic than it does in person. <https://imgur.com/a/xEbbFZ5> |
| Rheilly Phoull <rheilly@bigslong.com>: Jun 30 11:28AM +0800 On 30/06/2021 11:18 am, bitrex wrote: > this at the maximum excursion of the contrast control. A lil worse in > the pic than it does in person. > <https://imgur.com/a/xEbbFZ5> Okay, I use the blue modules with the pot turned back until the blocks are only a little darker than the background which isn't too bad. |
| "ohg...@gmail.com" <ohger1s@gmail.com>: Jun 29 11:02AM -0700 On Tuesday, June 29, 2021 at 11:01:36 AM UTC-4, Allodoxaphobia wrote: > > It would run on Windows XP class hardware with sufficient RAM (2GB+). > Of course, any discerning computer user would install linux or FreeBSD. > That should work for CPUs down to "W95 Class". I have a desktop PC at home I built about 2004 or thereabouts. It's a Pent IV with an Intel MB and XP Pro and all the RAM it can carry. Never had a blue screen or any kind of issue or crash with it. Now, Firefox crawls and some pages don't load or load incompletely. I tried installing two different distros Linux, and both were *more* laggy than the XP, so I went back to the XP. For work I have to use one of my two laptops. Sadly, it's time to pull the plug on this old friend and my new build will be with Linux, maybe Mint. |
| Michael Trew <mt999999@ymail.com>: Jun 29 02:15PM -0400 On 6/29/2021 11:01 AM, Allodoxaphobia wrote: > Of course, any discerning computer user would install linux or FreeBSD. > That should work for CPUs down to "W95 Class". That would likely be the route I take... I will avoid anything Google as much as possible. I really need to install it on one of my older machines to toy with and get used to the interface, so I don't have a "culture shock" the day that I finally need to switch. |
| Michael Trew <mt999999@ymail.com>: Jun 29 02:16PM -0400 > I tried installing two different distros Linux, and both were*more* laggy than the XP Did you try something light like Puppy Linux? |
| Rob <nomail@example.com>: Jun 29 07:32PM >> It would run on Windows XP class hardware with sufficient RAM (2GB+). > Of course, any discerning computer user would install linux or FreeBSD. > That should work for CPUs down to "W95 Class". You can do that, but it would require that you study how to install and admin that. The beauty of a ChromeBook is that it "just works". |
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